1.1 ,This specification covers rail-steel and axle-steel bars for concrete reinforcement. Three types of product are included, designated with a “,rail symbol,”, and an “,R”, for bars made of rail-steel and with an “,A”, for bars made of axle-steel. The standard sizes and dimensions of deformed bars and their number designations are given in Table 1. All sizes and grades of all types may not be readily available, manufacturers should be consulted to verify availability.